Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Convertible Debt

The Convertible Notes consist of the following (in thousands):

	December 31, 2017			December 31, 2016
Liability component
Principal	$	1,437,483		$	1,437,500
Less: note discount and issuance costs	(51,159		)	(89,344		)
Net carrying amount	$	1,386,324		$	1,348,156
Equity component
Temporary Equity	$	—		$	79,495
Additional paid-in-capital	162,869			83,374
Total equity (including temporary equity)	$	162,869		$	162,869

Schedule of Interest Expense Recognized Related to Convertible Notes

The following table includes total interest expense recognized related to the Convertible Notes (in thousands):

	Year Ended December 31,
	2017		2016		2015
Contractual interest expense	$	7,187	$	7,187	$	7,188
Amortization of debt issuance costs	3,959		3,863		3,974
Amortization of debt discount	34,018		33,014		32,039
	$	45,164	$	44,064	$	43,201